1-[(6-Chloropyridin-3-yl) methyl]-10-nitro-1,2,3,5,6,7,8,9-octahydro-5,9-methanoimidazo[1,2-a] azocin-5-ol

In the title compound, C16H19ClN4O3, the cyclohexane ring displays a chair formation and the tetrahydropyridine ring displays an envelope conformation with the methylene C atom as the flap; the imidazolidine ring also displays an envelope conformation with a methylene C atom as the flap. In the crystal, O-H center dot center dot center dot N hydrogen bonds between hydroxy groups and pyridine rings link inversion-related molecules into dimers. Weak C-H center dot center dot center dot O hydrogen bonds further link the dimers into supramolecular chains running along the c axis.